17/6/2021 BRIDGE COURSE CLASS VIDEO

17/6/2021 BRIDGE COURSE CLASS VIDEO


 

17/6/2021 BRIDGE COURSE CLASS VIDEO

Is a small unit with a few buttons (keys) on top and which can be rotated on a hard surface.  As the mouse moves over the surface, so does the pointer over the screen.  There is at least one button on the mouse.  Many input devices convert data into mechanical language, i.e. convert the machine into a readable form.  

This information stays in the main memory until the commuter is switched off.  This information is lost when the commuter is switched off or the commuter is reset.  We need secondary or secondary memory to store information for a long time.  Secondary memory is not temporary and retains information for a long time.  Units that use secondary memory are called secondary storage devices.  Hard disks and compact disks are common examples of secondary storage devices. 



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